Cooling Fan Motor, A/C Clutch - Inoperative
NO.: 08-33-92GROUP: Electrical
DATE: Dec. 14, 1992
SUBJECT:
Repeated Failure of Fusible Link
MODELS:
1993 (AS) Caravan/Grand Caravan/Caravan CV
Voyager/Grand Voyager/Town & Country
SYMPTOM/CONDITION:
Some vehicles may experience an intermittent short in the cooling fan motor that causes the A16 200R fusible link to go open circuit. Replacement of the fusible link is not a permanent repair when this condition exists. Failure of this fusible link results in the loss of cooling fan and air conditioning clutch operation.
DIAGNOSIS:
1. Remove the high speed fan control relay (refer to Figure 1) from its connector and check for continuity between battery positive and relay cavity labeled A16 12GY (refer to Figure 2). If there is continuity the fusible link is good and this Technical Service Bulletin does not apply, refer to the 1993 Powertrain Diagnostic Manual (Publication Number 81-699-0304) for further diagnosis.
2. Using an ohmmeter set to the low ohms range, connect the two probes together. This will measure the resistance of the meter leads. Allow the reading to settle to a fixed reading. Record the reading.
3. Attach one meter probe to battery negative and the other probe to the high speed fan control relay connector cavity labeled C25 12LG (refer to Figure 1 and 2). Make sure the probes have a solid attachment, the vehicle will be bounced later in the procedure. Read the resistance and subtract the reading previously recorded from it to get the actual resistance of the motor circuit. The result should be 0.5 - 0.6 ohms.
3a. If the result is zero ohms, a short exists in the motor or wiring. Disconnect the wiring connector from the cooling fan motor and repeat the measurement. If the short still exists, it is in the wiring. Locate and repair the short. If the meter indicates an open circuit, the cooling fan motor is shorted and the cooling fan module should be replaced.
3b. If the reading is in the 0.5 ohm range, bounce and rock the front end of the vehicle. If the reading goes to zero ohms, an intermittent short exists. Repeat the test with the cooling fan motor connector disconnected. If the short remains or returns when the vehicle is bounced and rocked again, the short is in the wiring, repair as necessary. If the short no longer occurs, the cooling fan motor has an intermittent short and the cooling fan module should be replaced.
4. Repeat steps 2 and 3 for the cooling fan low speed relay. Use the cavity of the low speed fan control relay connector labeled C23 12DG and battery negative (refer to Figure 1 and 3).
PARTS REQUIRED:
1 Fusible Link 4364878
1 Module, Cooling Fan 4644367
REPAIR PROCEDURE:
This bulletin involves replacing the cooling fan module and A16 200R fusible link.
1. Disconnect the wiring connector to the cooling fan motor.
2. Remove the right and left retaining screws at the module upper attachment points.
3. Move the module so its upper right mounting tab is disengaged from behind the A/C condenser mounting bracket. Remove the cooling fan module from the vehicle.
4. Install the new cooling fan module (PN 4644367) by reversing the previous steps. Be sure the upper right mounting tab of the cooling fan module is positioned between the radiator and the A/C condenser mounting bracket.
5. Replace the A16 200R fusible link using the procedure on page 8W-4 of the 1993 Front Wheel Drive/All Wheel Drive Van/Wagon Service manual.
6. Verify proper operation of the system.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No. 07-15-01-90 0.6 Hrs.
FAILURE CODE: 58 - Internal Defect